A Convenient Synthesis ofN‐Boc‐Protected α‐Aminonitriles from α‐Amidosulfones
摘要:
Synthesis of N-Boc-protected alpha-aminonitriles starting from N-Boc-protected alpha-aminosulfones is described. Treatment of the sulfone with two equivalents of potassium cyanide in 2-propanol or dichloromethane-H2O under phase transfer condition affords crystalline N-Boc-protected alpha-aminonitriles in good yield. Hydrolysis of the aminonitriles provides a convenient access to racemic a-amino acids.
of phenylglycinol derivatives with terminal and internalalkynes directed by picolinamide auxiliary has been developed. This method offers an efficient and highly regioselective route for the synthesis of 1-hydroxymethyltetrahydroisoquinolines. The reaction employs commercially available Co(II) catalyst in the presence of Mn(III) cooxidant and oxygen as a terminal oxidant, and proceeds with full preservation
Isothiazoles. Part IV. Cycloaddition reactions of diaryl-oxazolones and münchnones to 3-diethylamino-4-(4-methoxyphenyl)-isothiazole 1,1-dioxide: a new synthesis of triarylpyrroles
作者:Paola Baggi、Francesca Clerici、Maria L Gelmi、Sabrina Mottadelli
DOI:10.1016/0040-4020(94)01110-l
日期:1995.2
with oxazolones 2 and münchnones 7 affording with satisfactory yield 3-diethylamino-4,6-diaryl-3a,4-dihydro-3a-(4-methoxyphenyl)-6aH-pyrrolo[3,4-d]isothiazole 1,1-dioxides 4 and 3-diethylamino-4,6-diaryl-5-alkyl-3a-(4-methoxyphenyl)-pyrrolo[3,4-d]isothiazole 1,1-dioxides 8, respectively. The behaviour of the cycloadducts towards elevated temperatures and/or basic conditions was investigated. Under these
Enantioselective Construction of Consecutive Tetrasubstituted Stereogenic Centers by Reaction of α-Substituted β-Nitroacrylates with Oxazol-5-(4<i>H</i>)-ones Catalyzed by Cinchona Alkaloid Sulfonamide Catalysts
The enantioselective reaction of α-substituted β-nitroacrylates with oxazol-5-(4H)-ones (oxazolones) to construct consecutive tetrasubstituted stereogenic centers was accomplished. A cinchonaalkaloid sulfonamide catalyst afforded products bearing vicinal chiral centers with excellent enantio- and diastereoselectivities. The obtained products were successively converted into various chiral compounds
完成了α-取代的 β-硝基丙烯酸酯与 oxazol-5-(4 H )-ones (oxazolones) 的对映选择性反应,构建连续的四取代立体中心。金鸡纳生物碱磺酰胺催化剂为带有邻位手性中心的产物提供了出色的对映和非对映选择性。将所得产物连续转化为各种手性化合物而不损失其对映体纯度。此外,还进行了密度泛函理论 (DFT) 计算,以阐明观察到的反应立体选择性的机制和起源。
Use of the Chiral Pool - Practical Asymmetric Organocatalytic Strecker Reaction with Quinine
Abstractmagnified imageAn efficient, organocatalytic enantioselective synthesis of N‐arylsulfonyl α‐amino nitriles from the corresponding α‐amido sulfones has been developed. This quinine‐catalyzed Strecker reaction provides the corresponding cyanated products in good yields and enantioselectivities.